Tired, stressed.. Scared

Beth
I'm not sleeping well in a night I get maybe 4hrs I have a angry 6 year old I'm alone most of the time because my husband works 50-60 hours a week at night he's gone from 2:30pm to 3-5am and then asleep till 9:30-10am and then gone again.. 
It's just me raising our kids and I told him we need a nanny.. I wanna go back to work I need an extra set of hands bad please..
But here's the problem my lazy mother occupies the finished basement where the nanny would reside and her apartment isn't ready. She doesn't help much with either child.
Always has a new pain or body issue that makes her unable to help me or do much.
But can sit at the slots for a few hours No problem..
Husband and I are annoyed I'm scared I'm gonna snap on someone..
I feel lost and hurt. I wanna be there for both kids I am trying it's just not easy..